4. If a, (a - 2)and 3a are in A.P.then the value of a is
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a , a-2 , 3a are in AP
so it's common difference between the terms is equal
common difference (d) :
=>a2-a1 =a3-a2
=>a-2-a=3a-(a-2)
=>-2=3a-a+2
=>-2=2a+2
=>2a= -2-2
=>a= -4/2
=>a=-2
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